Things that have worked for me:

1. Radio on CBC Overnight (broadcasts from foriegn lands)
2. Reading until my eyes shut
3. Really strong Chamomile tea (often the teas you buy are old and weak)
4. Hauling out favourite memories and reliving them
5. Using a small soft shawl to lightly wrap my head, which is often cold (Nightcaps should never have gone out of style).